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In this simple example, we're going to be using the default fireball preset within Houdini and using the Kaboom Box HDA to lookdev and render our fireball.  Please make sure that you have installed the HDA correctly, before proceeding.

First up, we need to create a geometry node and once created, dive inside and then drop down a Pyro Configure Fireball node.

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Once the network has been created, we need to drop down a RenderMan Kaboom Box node and pipe this into the network after the pyrosolver node.

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